Could Legionnaires' bacteria lurk in idled buildings?

What are the potential sources of tainted water in an unoccupied building? When a building is unoccupied, water stagnates in the building's plumbing systems and the disinfectant (chlorination) dissipates. Bacteria can then multiply and form biofilms on the internal surfaces. Without regular use of water, the temperature in these systems may rise or fall into the range in which Legionella bacteria can grow. As a result, the hot and cold tap water systems—including storage tanks, ice machines, drinking fountains and water softeners—can become unsafe. Other potential sources of Legionella include sprinkler systems, decorative fountains, hot tubs, eyewash stations, safety showers, humidifiers and idle cooling towers. Read more....